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Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Investments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance $ 12,954 $ 12,482
Total Realized and Unrealized Gains (Losses) 929 415
Purchases and Issuances 1,414 488
Sales and Settlements (8,898) (442)
Transfers In (Out) (453) 11
Ending Balance 5,946 12,954
Mortgage and Other Asset-Backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 40 16
Total Realized and Unrealized Gains (Losses)    (1)
Purchases and Issuances    116
Sales and Settlements (8) (89)
Transfers In (Out) (32) (2)
Ending Balance    40
Municipal Obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 239 402
Total Realized and Unrealized Gains (Losses) (3) 21
Purchases and Issuances    8
Sales and Settlements    (192)
Transfers In (Out)     
Ending Balance 236 239
Interest Rate Lock Commitments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance     
Total Realized and Unrealized Gains (Losses) 2,375  
Purchases and Issuances     
Sales and Settlements     
Transfers In (Out)     
Ending Balance 2,375  
Total Realized and Unrealized Gains (Losses) (3,653)  
Transfers In (Out)     
Ending Balance 3,653  
Auction Rate Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 72,118 68,161
Total Realized and Unrealized Gains (Losses) (1,409) (2,974)
Purchases and Issuances 21,875 34,902
Sales and Settlements (7,460) (27,971)
Transfers In (Out)     
Ending Balance 85,124 72,118
Beginning Balance 100 50
Purchases and Issuances 100 50
Sales and Settlements   (100)
Transfers In (Out)      
Ending Balance   100
ARS Purchase Commitments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 2,647 2,347
Total Realized and Unrealized Gains (Losses) 47 (300)
Transfers In (Out)      
Ending Balance $ 2,600 $ 2,647